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PPRuNe Forums (https://www.pprune.org/)
-   Rotorheads (https://www.pprune.org/rotorheads-23/)
-   -   S76 OGE OEI perf (https://www.pprune.org/rotorheads/626963-s76-oge-oei-perf.html)

cpt 5th Nov 2019 16:00
S76 OGE OEI perf
 
Hi all,

Does someone know where to find or else, compute the S76 C++ OGE OEI performances?

Thanks!

Fareastdriver 5th Nov 2019 19:42
Zero answers; probably Zero performance.

krypton_john 5th Nov 2019 19:47
Curious to know why one would want to operate in such a scenario?

gulliBell 5th Nov 2019 19:55
Yeah, me too.

Jimmy. 5th Nov 2019 19:57
Looking at the lists of perfomance charts on the RFM (Section IV on both Part 1 and Part 2), there is no such data. You only will find charts for Hover Out of Ground Effect at Take Off Power AEO and Forward Climb Performance OEI (Sec IV, Part 1) and Hover Out of Ground Effect Endurance AEO (Sec IV, Part 2).

Sometimes military manuals have more specific performance data, but I have never heard about a military S-76. Glad to be corrected (and informed about engines and specs) if wrong.

Jimmy. 5th Nov 2019 19:59
Originally Posted by krypton_john (Post 10611642)
Curious to know why one would want to operate in such a scenario?
Some S-76 operate on a SAR role, so know the capabilities (or the lack of) on an engine failure during a hoist operation may be useful.

cpt 5th Nov 2019 20:22
Yes, I know the type well enough to expect a zero performance or almost, but I'm still curious to know whether something has been worked out.

Fareastdriver 6th Nov 2019 09:10
They operated the S76 in the SAR role in Hong Kong years ago. They then moved on to the AS 332L which gave you a chance at +30C over the water.

I operated the S76+ there for a time and it was enough trouble hovering with both going let alone one.

Collective Bias 6th Nov 2019 20:38
If you ask the right people at Sikorsky they have OEI HOGE charts for C+ and C++. Not impressive, but still, and at SL and ISA it is something that could be used.

CB

ShyTorque 6th Nov 2019 20:49
Originally Posted by Fareastdriver (Post 10612045)
They operated the S76 in the SAR role in Hong Kong years ago. They then moved on to the AS 332L which gave you a chance at +30C over the water.

I operated the S76+ there for a time and it was enough trouble hovering with both going let alone one.
I concur! It's the only twin engined helicopter I've flown where a running takeoff was sometimes needed for a SAR mission because we needed something near full fuel.

Jimmy. 7th Nov 2019 00:16
Originally Posted by ShyTorque (Post 10612593)
I concur! It's the only twin engined helicopter I've flown where a running takeoff was sometimes needed for a SAR mission because we needed something near full fuel.
Wich version?

212man 7th Nov 2019 10:23
Originally Posted by Jimmy. (Post 10612727)
Wich version?
Assuming Hong Kong, would have been A+ and C.

malabo 8th Nov 2019 02:16
Originally Posted by 212man (Post 10613034)
Assuming Hong Kong, would have been A+ and C.
Both dogs, and as SAR machines heavy dogs. We got a “good deal” on an ex-HK C+, then hopelessly tried to get it light enough to give customers some payload. Was always the first machine released. OEI HOGE was a new performance requirement for commercial SAR that had to comply with rules meant for passenger transport. Even with the (relatively) mighty AW139 we couldn’t train SAR in peak heat summer months (over 35C) because we’d be over the OEI HOGE weight of 5200 kg.

cpt 9th Nov 2019 13:29
Originally Posted by Collective Bias (Post 10612589)
If you ask the right people at Sikorsky they have OEI HOGE charts for C+ and C++. Not impressive, but still, and at SL and ISA it is something that could be used.

CB
Thank you Collective Bias.

It is also what I'm thinking, so I'll try to find "the right people" at Sikorsky and ask about.

ShyTorque 9th Nov 2019 14:41
Originally Posted by malabo (Post 10613629)

Both dogs, and as SAR machines heavy dogs. We got a “good deal” on an ex-HK C+, then hopelessly tried to get it light enough to give customers some payload. Was always the first machine released. OEI HOGE was a new performance requirement for commercial SAR that had to comply with rules meant for passenger transport. Even with the (relatively) mighty AW139 we couldn’t train SAR in peak heat summer months (over 35C) because we’d be over the OEI HOGE weight of 5200 kg.
That wouldn't have been an SAR version, though. It was presumably an ex "Sky Shuttle" machine.

212man 9th Nov 2019 17:16
Originally Posted by ShyTorque (Post 10614718)
That wouldn't have been an SAR version, though. It was presumably an ex "Sky Shuttle" machine.
that’s what I was thinking - the SAR machines were Cs not C+s I thought

ShyTorque 9th Nov 2019 20:21
No, they were actually "A++" versions. The C's (or "B-" as they were sometimes scathingly called) were not SAR equipped.

212man 9th Nov 2019 20:33
Originally Posted by ShyTorque (Post 10614923)
No, they were actually "A++" versions. The C's (or "B-" as they were sometimes scathingly called) were not SAR equipped.
ah, thanks. So same engines but lighter airframes

gulliBell 9th Nov 2019 21:30
The old SkyShuttle C+'s didn't go to GFS....GFS had converted A-models with Arriel engines (the tail is a give-away it was once an A, the engine cowl is a give-away it has an Arriel). They also might have had a C for a while, but I'm reasonably sure they never operated a C+.


https://cimg7.ibsrv.net/gimg/pprune....5d4232d165.png

ShyTorque 10th Nov 2019 01:03
Originally Posted by gulliBell (Post 10614955)
The old SkyShuttle C+'s didn't go to GFS....GFS had converted A-models with Arriel engines (the tail is a give-away it was once an A, the engine cowl is a give-away it has an Arriel). They also might have had a C for a while, but I'm reasonably sure they never operated a C+.
No, GFS never operated the C+. They had three C airframes but changed to Eurocopter and all the Sikorsky aircraft were sold, including the three S-70s.


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